EP0747897A2 - Nabe-Sperrvorrichtung für Plattenkassette - Google Patents

Nabe-Sperrvorrichtung für Plattenkassette Download PDF

Info

Publication number
EP0747897A2
EP0747897A2 EP95650035A EP95650035A EP0747897A2 EP 0747897 A2 EP0747897 A2 EP 0747897A2 EP 95650035 A EP95650035 A EP 95650035A EP 95650035 A EP95650035 A EP 95650035A EP 0747897 A2 EP0747897 A2 EP 0747897A2
Authority
EP
European Patent Office
Prior art keywords
hub assembly
spindle motor
cylindrical body
latch member
disk cartridge
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP95650035A
Other languages
English (en)
French (fr)
Other versions
EP0747897A3 (de
Inventor
Brian R. Schick
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Iomega Corp
Original Assignee
Iomega Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Iomega Corp filed Critical Iomega Corp
Publication of EP0747897A2 publication Critical patent/EP0747897A2/de
Publication of EP0747897A3 publication Critical patent/EP0747897A3/de
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B17/00—Guiding record carriers not specifically of filamentary or web form, or of supports therefor
    • G11B17/02—Details
    • G11B17/04—Feeding or guiding single record carrier to or from transducer unit
    • G11B17/041—Feeding or guiding single record carrier to or from transducer unit specially adapted for discs contained within cartridges
    • G11B17/043—Direct insertion, i.e. without external loading means
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B17/00—Guiding record carriers not specifically of filamentary or web form, or of supports therefor
    • G11B17/02—Details
    • G11B17/022—Positioning or locking of single discs
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B17/00—Guiding record carriers not specifically of filamentary or web form, or of supports therefor
    • G11B17/02—Details
    • G11B17/022—Positioning or locking of single discs
    • G11B17/028—Positioning or locking of single discs of discs rotating during transducing operation
    • G11B17/0282—Positioning or locking of single discs of discs rotating during transducing operation by means provided on the turntable
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B23/00—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture
    • G11B23/0014—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture record carriers not specifically of filamentary or web form
    • G11B23/0021—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture record carriers not specifically of filamentary or web form discs
    • G11B23/0028—Details
    • G11B23/0035—Details means incorporated in the disc, e.g. hub, to enable its guiding, loading or driving

Definitions

  • the present invention relates to a mechanism for locking the hub of a removable disk cartridge to the spindle motor of a disk drive upon spin-up of the motor to prevent separation of the hub and spindle motor during high speed rotation.
  • Removable disk cartridges for storing digital electronic information typically comprise an outer casing or shell that houses one or more rotatable storage mediums, or disks, upon which electronic information can be stored.
  • the cartridge shell often comprises upper and lower halves that are joined together to house the disk(s).
  • the disk(s) is mounted on a hub assembly that rotates freely within the cartridge.
  • the outer shell of the cartridge typically has some form of opening near its forward edge to provide the recording heads of the drive with access to the recording surfaces of the disk.
  • a shutter or door mechanism is often provided to cover the opening when the cartridge is not in use to prevent dust or other contaminants from entering the cartridge and settling on the recording surface of the disk.
  • a spindle motor in the drive engages the hub assembly through an opening in the bottom shell of the disk cartridge in order to rotate the disk within the cartridge.
  • a center spindle on the motor engages a through-hole in the hub assembly, and a chucking magnet in the spindle and/or hub assembly provides sufficient force to keep the hub assembly engaged on the spindle motor during rotation.
  • Magnetic chucking provides sufficient engagement in most disk drives that operate at lower rotation speeds, as well as in most disk drive units that are internally mounted in a computer casing.
  • Applicant has discovered, however, that magnetic chucking is susceptible to failure in higher-speed, stand-alone disk drive units.
  • Applicant has found that if a stand-alone, removable cartridge disk drive is somehow gyrated while the spindle motor is operating at full speed, such as might occur if a user lifts the disk drive unit off a table or desk and moves it to a different position, the gyroscopic forces that result from such movement can cause the hub assembly of a disk cartridge to separate from the spinning motor. Separation of the hub assembly from the spinning motor is likely to cause severe damage to both the storage medium in the disk cartridge and to the internal components of the disk drive.
  • the hub assembly of the disk cartridge has an annular groove formed in its bottom surface.
  • the outer periphery of the annular groove undercuts the bottom surface of the hub assembly to form an annular lip around the outer periphery of the groove.
  • a data storage device designed to receive the disk cartridge has a spindle motor that comprises a freely rotating cylindrical body having an upper portion that provides a critical datum for engaging the bottom surface of the hub assembly of the disk cartridge.
  • At least one latch member is movably mounted on the upper portion of the cylindrical body.
  • the latch member has a projection that extends above an upper surface of the cylindrical body.
  • the projection has a hook-shaped cross-section adapted to engage the annular lip of the groove formed in the bottom surface of the hub assembly of the disk cartridge.
  • the latch member is movably mounted to the cylindrical body via a flexure.
  • the bottom surface of the hub assembly engages the upper portion of the cylindrical body of the spindle motor assembly, and the hook-shaped projection on the latch member enters the annular groove in the bottom of the hub assembly.
  • centrifugal forces act on the latch member causing it to move radially outwardly on its flexure until the hook-shaped projection engages the annular lip of the groove in the hub assembly. Once engaged, the latch member prevents the hub assembly from separating from the spindle motor.
  • the spindle motor assembly When it is time to eject the disk cartridge from the data storage device, the spindle motor assembly is brought back to rest. As the spindle motor assembly spins down, the centrifugal forces on the latch member will dissipate, allowing the latch member to return to a disengaged position. The spindle motor assembly can then be disengaged from the hub assembly.
  • a plurality of latch members are provided on the spindle motor assembly to provide additional security against separation of the hub and spindle motor assemblies.
  • the disk cartridge 10 comprises an outer casing consisting of upper and lower shells 10a, 10b, respectively.
  • the upper and lower shells 10a, 10b are formed of a rigid plastic material.
  • the disk cartridge 10 contains two disk-shaped storage mediums 15a, 15b (Fig. 3A) that are attached, in stacked relation, to a hub assembly 16 (Fig. 2) rotatably mounted within the outer casing. Further details of the hub assembly are provided hereinafter.
  • a door 12 on the casing provides access to the recording disks by the read/write heads of a disk drive.
  • the storage media comprise rigid magnetic media, however, other storage media may be employed, such as flexible magnetic media or optical media.
  • FIG 2 is a bottom view of the disk cartridge 10 of Figure 1.
  • the bottom shell 10b of the disk cartridge has an opening 14 that provides access to the hub assembly 16 within the cartridge 10.
  • the spindle motor of a disk drive engages the hub assembly 16 through opening 14 in order to rotate the storage media at relatively high speeds (e.g., 5400 rpm).
  • a slot 15 in the bottom shell engages a retaining tang (not shown) on the spindle motor housing to position the cartridge precisely within the drive.
  • FIGs 3A and 3B illustrate further details of the hub assembly 16 in accordance with the present embodiment.
  • two storage media 15a, 15b are mounted on the hub assembly 16.
  • an annular groove 18 is formed in the bottom surface 17 of the hub assembly 16.
  • Figure 3B which shows a cross-sectional view of the lower portion of the hub assembly 16
  • the outer periphery 18a of the annular groove 18 undercuts a portion of the bottom surface 17 of the hub assembly to form an annular lip 18b around the outer periphery of the groove 18.
  • the annular groove is approximately 2.2 mm wide and approximately 1.1 mm deep, however, the annular groove is by no means limited to such dimensions.
  • the hub assembly 16 is formed mainly of steel, however, other suitable materials may be employed. The purpose and function of the annular groove 18 are described hereinafter.
  • Figure 4 shows a data storage device, or disk drive 20, in accordance with the present embodiment.
  • An outer housing (not shown) of the disk drive 20 has been removed to reveal the internal components of the disk drive 20. Most of the components are mounted on an internal chassis 21.
  • a front panel 24 of the disk drive has an elongate, horizontal opening 22 through which the disk cartridge 10 of Figures 1-3 can be inserted.
  • An eject button 26 is provided on the front panel 24 for automatically ejecting a disk cartridge from the disk drive 20.
  • the disk drive 20 is configured for insertion into the housing of a computer system, such as a personal computer.
  • the disk drive 20 can also be employed as a stand-alone unit.
  • the front panel 24 is formed of plastic, and the housing (not shown) and drive chassis 21 are formed of metal, although other suitable materials may be employed.
  • An actuator arm 32 which forms part of a radial arm voice coil actuator, is pivotally mounted to the drive chassis 21 at 38.
  • the actuator arm 32 has a plurality of suspension arms 34 at its distal end that each carry a read/write head 36 for recording and reading information to and from respective surfaces of the storage media 15a, 15b of the cartridge 10.
  • a head loading mechanism 35 facilitates loading of the magnetic heads onto the disk surfaces.
  • a spindle motor assembly 110 of the present embodiment is mounted on the underside of the chassis 21.
  • a motor ring mechanism (not shown) translates the spindle motor assembly 110 vertically through an opening 23 in the drive chassis 21 in order to engage the bottom surface of the hub assembly 16 of the disk cartridge once the cartridge 10 is inserted in the disk drive 20.
  • Vertical translation of the spindle motor 110 via the motor ring mechanism is described in detail in co-pending, commonly assigned, U.S. patent application Serial No. 08/438,255, filed May 10, 1995, entitled “Disk Drive Having an Automatic Spindle Motor Loading Mechanism", which is incorporated herein by reference in its entirety.
  • FIG 5 is a perspective view of the spindle motor assembly 110 of Figure 4 in accordance with a preferred embodiment of the present invention.
  • the spindle motor assembly comprises an outer housing 112 that houses a freely rotating cylindrical body 114.
  • An upper surface 128 of the cylindrical body 114 provides a critical datum for engaging the bottom surface of the hub assembly 16 of the disk cartridge of Figures 1-3.
  • a center spindle 115 on the cylindrical body 114 is adapted to engage the central aperture of the hub assembly 16 of Figures 3A and 3B. Power is supplied to the spindle motor assembly 110 through a flex circuit 132.
  • a plurality of latch members 120a-c are movably mounted on the upper portion of the cylindrical body 114.
  • each latch member 120a-c is mounted at the end of a respective flexure 122a-c.
  • centrifugal forces act upon the latch members 120a-causing the latch members to move on their respective flexures 122a-c substantially radially outwardly of the cylindrical body 114.
  • three latch members 120a-c are movably mounted on the cylindrical body 114, and the three latch members 120a-c are spaced evenly about the circumference of the cylindrical body 114.
  • each of the latch members 120a-c has a projection 130a-c that extends above the upper surface 128 of the cylindrical body 114.
  • Each of the projections 130a-c has a hook-shaped cross-section adapted to engage the annular lip 18b of the undercut groove 18 formed in the bottom surface of the hub assembly 16 of the disk cartridge 10 of Figures 1-3.
  • FIG 7 is an exploded view of the spindle motor assembly 110 of Figure 5 showing further details of the construction of the assembly 110 in accordance with the preferred embodiment.
  • the flexures 122a-c are integrally formed from a single metallic sheet, and the latch members 120a-c are then attached to the respective flexures 122a-c as described hereinafter.
  • the flexure and latch member assembly 118 is then mounted in a recess 116 formed in the upper portion of the cylindrical body 114.
  • a substantially planar retaining member 119 secures the flexure and latch member assembly 118 within the recess 116.
  • the cylindrical body 114, the flexure and latch member assembly 118, and the retaining member 119 are all formed of metal, such as steel. However, any other suitable material may be employed.
  • FIG 8 is an enlarged view of the flexure and latch member assembly 118.
  • each of the latch members 120a-c is mounted to the distal end of a respective flexure 122a-c by bending the distal end 124a-c of the flexure at approximately a right angle and inserting the bent end of the flexure into a narrow slit 121a-c in the latch member.
  • Adhesive can be used to secure the ends of the flexures within the slits.
  • the proximal end 126a-c of each flexure is integrally formed with a circular base portion 127 of the assembly 118.
  • the circular base portion 127 and respective flexures 122a-c are stamped from a single sheet of metal, such as, for example, stainless steel having a thickness of approximately 0.125 mm. However, other suitable materials can be employed.
  • the portions of the assembly defining the flexures 122a-c are bent upwards (as best shown in Fig. 7) at right angles to the base portion 127 to impart radial movement to distal ends 124a-c of each flexure.
  • centrifugal forces will act on each latch member 120a-c causing the latch members to move substantially radially outwardly on their respective flexures 122a-c in the directions indicated by the arrows in Figure 8.
  • Figure 9 is a top view of the spindle motor assembly 110 of Figure 5.
  • Figure 10 is a cross-sectional view of the spindle motor assembly 110 taken along line 10-10 of Figure 9.
  • the hub assembly 16 of the cartridge 10 engages the upper portion of the spindle motor assembly 110.
  • the bottom surface 17 of the hub assembly 16 rests on the upper surface 128 of the cylindrical body 114 and on the upper surface of the retaining member 119.
  • the upper surface 128 and retaining member 119 provide critical datums to position the hub assembly 16 precisely within the disk drive.
  • the center spindle 115 of the spindle motor assembly 110 extends through a central aperture in the hub assembly 16.
  • the annular groove 18 on the bottom surface of the disk hub assembly 16 receives the respective projections 130a-c of the latch members 120a-c.
  • Figure 10 shows the position of the latch members 120a-c when the spindle motor is at rest.
  • the latch members 120a-c move in the recess 116 formed in the upper portion of the cylindrical body 114.
  • the outer periphery of the recess 116 forms an annular undercut 136 with the upper surface 128 of the cylindrical body 114.
  • a lateral projection 134 on the lower outer edge of each latch member 120a-c engages the annular undercut 136 when the latch members 120a-c move radially outwardly to their latched positions. This prevents the latch members 120a-c from lifting away from the upper portion of the cylindrical body 114 while the spindle motor is rotating.
  • the spindle motor assembly 110 When it is time to eject the disk cartridge 10, the spindle motor assembly 110 is brought back to rest. As the spindle motor 110 assembly spins down, the radial forces on the latch members 120a-c will dissipate, allowing the latch members 120a-c to spring back to the position shown in Figure 10. The spindle motor assembly 16 can then be disengaged from the hub assembly.
  • the present invention is directed to a mechanism for locking the hub of a removable disk cartridge to the spindle motor of a disk drive upon spin-up of the motor to prevent separation of the hub and spindle motor during high speed rotation.
  • changes may be made to the embodiment described above without departing from the broad inventive concepts thereof.
  • three latch members 120a-c are employed in the preferred embodiment, other embodiments may employ one, two or more than three latch members.
  • flexures 122a-c are employed in the preferred embodiment to impart radial movement to the latch members 120a-c, other means for movably mounting the latch members may be employed.
  • the components of the hub locking mechanism of the present invention are preferably formed of metal, other suitable materials, such as plastic, can be employed.

Landscapes

  • Holding Or Fastening Of Disk On Rotational Shaft (AREA)
  • Rotational Drive Of Disk (AREA)
EP95650035A 1995-06-06 1995-10-04 Nabe-Sperrvorrichtung für Plattenkassette Withdrawn EP0747897A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US46627695A 1995-06-06 1995-06-06
US466276 1995-06-06

Publications (2)

Publication Number Publication Date
EP0747897A2 true EP0747897A2 (de) 1996-12-11
EP0747897A3 EP0747897A3 (de) 1997-08-06

Family

ID=23851164

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95650035A Withdrawn EP0747897A3 (de) 1995-06-06 1995-10-04 Nabe-Sperrvorrichtung für Plattenkassette

Country Status (5)

Country Link
US (2) US5757584A (de)
EP (1) EP0747897A3 (de)
JP (1) JPH11511281A (de)
CA (1) CA2222715A1 (de)
WO (1) WO1996039694A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999022371A1 (en) * 1997-10-29 1999-05-06 Iomega Corporation A method and a system for engaging a disk drive spindle motor with a disk cartridge
US6205113B1 (en) 1998-08-18 2001-03-20 Iomega Corporation Plastic clamp with hub and platter for use in disc drive

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EP0747897A3 (de) * 1995-06-06 1997-08-06 Iomega Corp Nabe-Sperrvorrichtung für Plattenkassette
TW420347U (en) * 1999-01-11 2001-01-21 Sunonwealth Electr Mach Ind Co Transfer system structure of main axis motor for CD-ROM drive
US7227817B1 (en) 1999-12-07 2007-06-05 Dphi Acquisitions, Inc. Low profile optical head
US6580683B1 (en) 1999-06-23 2003-06-17 Dataplay, Inc. Optical recording medium having a master data area and a writeable data area
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US7191153B1 (en) 1999-09-10 2007-03-13 Dphi Acquisitions, Inc. Content distribution method and apparatus
US6631359B1 (en) 1999-09-10 2003-10-07 Dphi Acquisitions, Inc. Writeable medium access control using a medium writeable area
US6673479B2 (en) * 2001-03-15 2004-01-06 Hydrogenics Corporation System and method for enabling the real time buying and selling of electricity generated by fuel cell powered vehicles
EP1528563A4 (de) * 2002-08-06 2008-05-28 Matsushita Electric Ind Co Ltd Optisches datenträgermedium und verteiler
US9156139B1 (en) 2011-06-13 2015-10-13 Donald L. Ekhoff Disc spindle with flexible cap clamping
US8553518B1 (en) 2011-06-13 2013-10-08 Donald L. Ekhoff Disc spindle with internal particulate removal

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999022371A1 (en) * 1997-10-29 1999-05-06 Iomega Corporation A method and a system for engaging a disk drive spindle motor with a disk cartridge
US6128151A (en) * 1997-10-29 2000-10-03 Iomega Corporation Method and a system for engaging a disk drive spindle motor with a disk cartridge
US6205113B1 (en) 1998-08-18 2001-03-20 Iomega Corporation Plastic clamp with hub and platter for use in disc drive
US6347070B1 (en) 1998-08-18 2002-02-12 Iomega Corporation Plastic clamp with hub and platter for use in disc drive

Also Published As

Publication number Publication date
US5757584A (en) 1998-05-26
CA2222715A1 (en) 1996-12-12
JPH11511281A (ja) 1999-09-28
WO1996039694A1 (en) 1996-12-12
US6115211A (en) 2000-09-05
EP0747897A3 (de) 1997-08-06

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